20340256 has 24 divisors (see below), whose sum is σ = 40158720. Its totient is φ = 10141248.

The previous prime is 20340251. The next prime is 20340263. The reversal of 20340256 is 65204302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20340251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14665 + ... + 15991.

It is an arithmetic number, because the mean of its divisors is an integer number (1673280).

Almost surely, 2^20340256 is an apocalyptic number.

It is an amenable number.

20340256 is a deficient number, since it is larger than the sum of its proper divisors (19818464).

20340256 is a wasteful number, since it uses less digits than its factorization.

20340256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816 (or 1808 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20340256 is about 4510.0172948671. The cubic root of 20340256 is about 272.9724419489.

Adding to 20340256 its reverse (65204302), we get a palindrome (85544558).

The spelling of 20340256 in words is "twenty million, three hundred forty thousand, two hundred fifty-six".